Damon Albarn performs a song from his new stage show about 16th Century alchemist, astrologer and spy John Dee.It’s a musical work based on Elizabeth I's medical and scientific adviser, Doctor Dee and premieres in July at the Manchester International Festival.It will then be staged at the home of the English National Opera as part of London's Cultural Olympiad programme.You can watch the Andrew Marr Show in full on the BBC iPlayer